Method for preparing titanium dioxide hydrosol at room temperature, titanium dioxide hydrosol and application thereof

Abstract

The invention discloses a method for preparing a titanium dioxide hydrosol at room temperature. The method comprises the following steps: (1) measuring the same volume of acetic acid and lactic acid, dropwisely adding into organic solvent, and performing uniform magnetic stirring to obtain a solution A; (2) dropwisely adding a titanium source into the solution A, and performing uniform magnetic stirring to obtain a solution B, wherein the titanium source is titanium tetrachloride, isopropyl titanate or tetrabutyl titanate, and the volume ratio of the titanium source to the solution A is (1:1)-(3:1); and (3) dropwisely adding deionized water into the solution B, and performing magnetic stirring to obtain the TiO2 hydrosol. The invention also discloses the titanium dioxide hydrosol prepared by the method for preparing a titanium dioxide hydrosol at room temperature and application thereof. According to the invention, preparation of a titanium dioxide hydrosol visible light photocatalyst under room temperature conditions is realized, and energy is saved; and the titanium dioxide hydrosol has favorable visible light catalytic activity.

Description

technical field [0001] The invention relates to a titanium dioxide hydrosol, in particular to a method for preparing the titanium dioxide hydrosol at room temperature, the titanium dioxide hydrosol and its application. Background technique [0002] Photocatalytic technology is an advanced oxidation technology that utilizes photocatalytic materials to realize light source (such as sunlight) to stimulate catalytic degradation of organic matter, and plays an important role in the control and governance of environmental pollution. As a typical photocatalytic material, titanium dioxide has the advantages of stable photochemical properties, non-toxicity, low price, can oxidize and degrade most organic pollutants and does not produce secondary pollution, etc. It is one of the most potential green catalysts. one. However, TiO 2 is a wide bandgap (E g =3.2eV) semiconductor oxides, which can only absorb the energy of the shorter wavelength ultraviolet light (λ≤387nm) in sunlight, a...

AI Technical Summary

Problems solved by technology

Co-precipitation method, molten salt method, and sol-gel method generally require subsequent high-temperature treatment, which requires high energy consumption, and treatment at high temperature will lead to uneven particle size distribution or irregular powder morphology, and due to grain growth and surface The dehydroxylation process often causes a significant decrease in the specific surface area and degree of hydroxylation of the material, resulting in a decrease in catalytic activity.

Although the hydrothermal method can prepare nano-titanium dioxide photocatalysts, the reaction temperature is usually above 150 °C, and centrifugation or filtration of the reaction product after hydrothermal treatment will lead to particle accumulation and a decrease in the degree of surface hydroxylation.

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